U r u g, tumbled down, fallen by crumbling down. Slipped down, as earth from a hill-side, stones which have been piled up or the like. To fall as water at a cascade. To fill up a hollow by putting earth into it. To lay gravel or materials on a road. A landslip.

U r u r u g a n, apparently a plaural from of 'Urug'. To go with a number of men to any work. To make war, to attack with an army. To set upon in numbers, as it were to timble upon in masses.